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First ionisation enthalpy generally increases across a:
ABlock
BPanel
CPeriod
DGroup
Answer & Solution
Correct answer: C. Period
1. Two directions are compared in the periodic table.
2. Across one of them the value rises.
3. That is across a period.
_Source: NCERT Class 11 Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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